JP2009274593A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a flow rate of low-temperature gas while restraining a total mass of parts required for an air conditioning system at a small number of parts and a small processing manhour in an air conditioning system having a heat exchanging part for exchanging heats of high-temperature gas flowing in a high-temperature gas flow path and low-temperature gas flowing in a low-temperature gas flow path, and a bypass flow path provided by communicating an upstream side and a downstream side of the heat exchanging part of the low-temperature gas flow path for flowing the gas flowing in the low-temperature gas flow path not through the heat exchanging part. <P>SOLUTION: In this air conditioning system 1, a check valve 9 is provided in a bypass flow path, and is normally energized under a closing condition. When a difference of a pressure directly received by the check valve from the upstream side and the downstream side of the heat exchanging part of the low-temperature gas flow path is not less than a predetermined value, the check valve is changed to an opening condition against an energizing force by the pressure directly applied to the check valve from the upstream side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioning system having a heat exchanger that performs heat exchange between a high-temperature gas flowing in a high-temperature gas flow path and a low-temperature gas flowing in a low-temperature gas flow path.

  As an example of the configuration of an air conditioning system that has been conventionally used, one that has a configuration that allows heat exchange between a gas flowing in a low-temperature gas flow channel and a gas flowing in a high-temperature gas flow channel is widely known. ing. As such an air conditioning system, for example, it is used for aircraft, and as shown in FIG. 5, hot air serving as a high-temperature gas flow path for supplying the extraction air from the engine b and circulating the extraction air compressed by the compression means c A flow path d, a low-temperature air flow path f that is a low-temperature gas flow path through which low-temperature air adiabatically expanded in the expansion means e is circulated, extraction air in the high-temperature air flow path d, and low-temperature air in the low-temperature air flow path f. The heat of the low-temperature air flow path f so that the low-temperature air flowing through the low-temperature air flow path f is allowed to flow without passing through the heat exchange section g. A bypass channel h provided by communicating a site f1 upstream from the exchange part g and a site f2 downstream, and a flow rate adjusting means i provided in the bypass channel h and capable of changing the opening degree. Is mentioned. The bypass flow path h has a sufficient amount of temperature-controlled air when the moisture in the air freezes in the expansion means e and adheres to the heat exchange part g, and the low-temperature air flow path f is blocked. It is provided in order to suppress the occurrence of problems that make it impossible to supply the product. Further, the flow rate adjusting means i includes an upstream portion f1 and a downstream portion f2 of the heat exchanging portion g that are generated in the low temperature air passage f when the low temperature air passage f is blocked. The opening degree is changed according to the pressure difference, and the flow rate of the low-temperature air passing through the bypass flow path h is adjusted (see, for example, Patent Document 1).

Further, instead of providing the bypass flow path h, a swirl flow generating means or a double pipe (not shown) is provided upstream of the heat exchange part g in the low temperature air flow path f to centrifuge the frozen water in the low temperature air. At the same time, the refrigerant for cooling the electronic device is guided to the gap between the inner tube and the outer tube of the double pipe, and the refrigerant is cooled by this frozen moisture, and at the same time, the frozen moisture is melted into the heat exchange part g. The structure which suppresses adhesion of the icing water | moisture content of this is also considered (for example, refer patent document 2).
JP 2002-321697 A JP 2004-90777 A

  By the way, in the configuration of Patent Document 1, in order to change the opening degree of the flow rate adjusting means according to the pressure difference between the upstream side and the downstream side of the heat exchange unit, the upstream side and the downstream side of the heat exchange unit Therefore, it is necessary to provide a special mechanism for detecting the pressure difference and reflecting the difference in the opening degree of the flow rate adjusting means outside the flow rate adjusting means. On the other hand, in the configuration of Patent Document 2, a swirling flow generating means, a double pipe, a pipe line for guiding the electronic device cooling refrigerant to the gap between the inner pipe and the outer pipe of the double pipe, and the like are specially prepared. There was a need.

  That is, in these configurations, the configuration becomes complicated, and the number of parts and the number of processing steps increase. Furthermore, in these structures, the mass as the whole air conditioning system becomes large.

  An object of the present invention is to solve the above-described problems, that is, to solve the problem that an air supply pipe is blocked by icing moisture without greatly increasing the mass of the entire air conditioning system with a simple configuration.

  In order to solve the above-described problems, an air conditioning system according to the present invention includes a high-temperature gas channel that circulates a high-temperature gas, a low-temperature gas channel that circulates a low-temperature gas, and a high-temperature gas that circulates in the high-temperature gas channel. A heat exchanging part for performing heat exchange with the low-temperature gas flowing in the low-temperature gas flow path, and the low-temperature to flow the gas flowing in the low-temperature gas flow path without passing through the heat exchange part A bypass passage provided upstream and downstream of the heat exchange portion of the gas passage, and a check valve provided in the bypass passage, the check valve comprising: Normally, the check valve is energized in a closed state, and the check valve receives a difference in pressure directly received from the upstream side and the downstream side of the heat exchange section of the low-temperature gas flow path. It is attached by direct acting pressure. Wherein the change against the force to the open state.

  If this is the case, a special mechanism for detecting the pressure difference between the upstream side and the downstream side of the heat exchanging unit is not provided outside the check valve, and a swirling flow for removing frozen moisture is removed. By using a simple configuration in which the check valve is mechanically opened by pressure directly acting on the check valve without using a generating means or a double pipe, the low temperature gas can be bypassed.

  The bypass flow path may be provided outside the housing that houses the heat exchange section, and the high-temperature gas flow path is formed between the plurality of heat exchange sections and the heat exchange section and has a partition wall. The bypass flow path partitioned and the check valve provided in the bypass flow path may be provided in the same housing.

  According to the configuration of the air conditioner of the present invention, a special mechanism for detecting the pressure difference between the upstream side and the downstream side across the heat exchange part is not provided outside the check valve, and the low temperature gas flow path is provided. When the difference in pressure directly received by the check valve from the upstream side and the downstream side from the heat exchanging part is greater than or equal to a predetermined value, the check valve changes to an open state against the urging force by the pressure acting directly on the check valve. Therefore, the low-temperature gas can be bypassed with a simple configuration to ensure the flow rate of the low-temperature gas. Therefore, it is not possible to supply a sufficient amount of temperature-controlled gas due to adhesion of icing moisture to the heat exchanging part while reducing the total number of parts required for this configuration and the number of parts and processing steps. Can be suppressed.

  An embodiment of the present invention will be described below with reference to the drawings.

  As schematically shown in FIG. 1, the air conditioning system 1 of this embodiment receives a supply of extraction from the engine 2 and compresses the extraction air compressed by the compressor 3. A high-temperature air flow that allows high-temperature engine bleed air (hereinafter referred to as high-temperature air) to be circulated between the turbine 4 as expansion means for adiabatic expansion and communication between the outlet of the compressor 3 and the inlet of the turbine 4 and compressed by the compressor 3. A low-temperature air passage 6 through which the air after adiabatic expansion in the turbine 4 (hereinafter referred to as low-temperature air) flows, high-temperature air through the high-temperature air passage 5 and the low-temperature air flow Capacitor 7 for performing heat exchange with the low-temperature air flowing in the path 6 and low-temperature air flowing in the low-temperature air flow path 6 circulate without passing through the capacitor 7 A bypass passage 8 in which a portion 6a on the upstream side of the condenser 7 and a portion 6b on the downstream side of the condenser 7 of the low-temperature air passage 6 are connected to each other, and a check valve 9 provided in the bypass passage 8; The air conditioner which comprises is used. Here, the low temperature air flow path 6 corresponds to the low temperature gas flow path of the present invention, the high temperature air flow path 5 corresponds to the high temperature gas flow path of the present invention, and the capacitor 7 corresponds to the heat exchange section of the present invention.

  A primary heat exchanger 10 is provided between the engine 2 and the compressor 3 to precool the engine bleed air by exchanging heat between the ram air and the engine bleed air.

  The compressor 3 and the turbine 4 constitute an air cycle machine coupled by a common drive shaft 11.

  In the middle of the high-temperature air flow path 5, a secondary heat exchanger 13 that cools the high-temperature air compressed by the compressor 3 with ram air, and between the secondary heat exchanger 13 and the condenser 7. A regenerative heat exchanger 14 provided and a water separator 15 provided on the downstream side of the condenser 7 for removing moisture from the air cooled by the condenser 7 are provided. The downstream side of the water separator 15 in the high-temperature air flow path 5 communicates with the inlet side of the turbine 4 through the regenerative heat exchanger 14. The regenerative heat exchanger 14 exchanges heat between high-temperature air before heat exchange with low-temperature air in the condenser 7 and high-temperature air after heat exchange with low-temperature air in the condenser 7. Make it. The water separator 15 separates and removes moisture in the air, which is condensed when cooled by heat exchange with the low-temperature air flowing through the low-temperature air flow path 6 in the condenser 7, using centrifugal force. .

  The low-temperature air flow path 6 communicates the outlet of the turbine 4 with a pressurizing chamber (not shown) such as in an aircraft cabin. Further, the capacitor 7 is disposed in the middle of the low-temperature air flow path 6.

  Although not shown in the figure, for example, a large number of flat plates are stacked in the capacitor 7, and a high-temperature side passage for passing high-temperature air and low-temperature air are allowed to pass between adjacent plates. The low-temperature side passages are alternately provided, and heat exchange is performed between the high-temperature air in the high-temperature side passage and the low-temperature air in the low-temperature side passage.

  The bypass flow path 8 is provided outside the housing of the capacitor 7, and communicates the portion 6 a upstream of the capacitor 7 and the portion 6 b downstream of the capacitor 7 of the low-temperature air flow path 6. To do. As described above, the check valve 9 is provided in the bypass passage 8.

  The check valve 9 is normally biased to a closed state by a biasing force from a biasing means such as a spring (not shown), and the check valve 9 is checked from the upstream side and the downstream side of the condenser 7 in the low-temperature air flow path 6. When the difference in pressure directly received by the valves 9 is greater than or equal to a predetermined value, the valve 9 changes to the open state against the biasing force. That is, the pressure received by the check valve 9 directly from the portion 6 a upstream of the capacitor 7 in the low-temperature air flow path 6 is reduced from the portion 6 b downstream of the capacitor 7 in the low-temperature air flow path 6. When the sum of the directly received pressure and the urging force is exceeded, the check valve 9 changes to the open state against the urging force by the action of the pressure directly received by the check valve 9.

  Hereinafter, the flow of air in the air conditioner will be described.

  As described above, this air conditioner receives supply of extraction air from the engine 2. This bleed air is first cooled to some extent by exchanging heat with ram air in the primary heat exchanger 10. Subsequently, it is adiabatically compressed in the compressor 3 and guided to the high-temperature air flow path 5. The high-temperature air guided to the high-temperature air flow path 5 is cooled to some extent by exchanging heat with ram air in the secondary heat exchanger 13. The air in the high-temperature air flow path 5 cooled by the secondary heat exchanger 13 is then led to the regenerative heat exchanger 14, and is cooled by exchanging heat with the low-temperature air in the condenser 7. Exchange heat with. The hot air in the hot air passage 5 that has passed through the regenerative heat exchanger 14 then reaches the condenser 7. By performing heat exchange with the low-temperature air flowing through the low-temperature air flow path 6 in the condenser 7, the high-temperature air is cooled, and moisture in the high-temperature air is condensed. Most of the condensed water in the high-temperature air is separated and removed by the water separator 15. The high-temperature air from which moisture has been separated and removed is guided to the regenerative heat exchanger 14 for heat exchange, and then adiabatically expands in the turbine 4. Then, the low temperature air after adiabatic expansion in the turbine 4 is introduced into the low temperature air flow path 6, and at least a part thereof is guided to the capacitor 7. The low temperature air led to the condenser 7 is used for heat exchange with the high temperature air flowing through the high temperature air flow path 5. Then, after being subjected to heat exchange with the high-temperature air, it is supplied to the pressurizing chamber.

  Here, when the differential pressure between the upstream portion 6a and the downstream portion 6b of the low temperature air flow path 6 is lower than a predetermined value, the low temperature air flow path 6 is upstream of the condenser 7. The pressure directly received by the check valve 9 from the portion 6a is lower than the sum of the pressure and the biasing force directly received by the check valve 9 from the portion 6b on the downstream side of the condenser 7 of the low-temperature air passage 6. Accordingly, the check valve 9 provided in the bypass flow path 8 remains closed, and the entire amount of the low-temperature air is guided to the condenser 7 and used for heat exchange with the high-temperature air flowing through the high-temperature air flow path 5. Is done. On the other hand, when the differential pressure between the upstream portion 6a and the downstream portion 6b of the low-temperature air passage 6 exceeds a predetermined value, the upstream portion of the low-temperature air passage 6 is upstream of the condenser 7. The pressure directly received by the check valve 9 from the portion 6a exceeds the sum of the pressure and the biasing force directly received by the check valve 9 from the portion 6b downstream of the condenser 7 in the low-temperature air flow path 6. Therefore, the check valve 9 is directly affected by the pressure from the portion 6a upstream of the condenser 7 in the low-temperature air flow path 6, and changes to the open state against the urging force. A part of the low-temperature air flows through the bypass flow path 8 and is led downstream without performing heat exchange, and reaches a pressurized chamber (not shown) such as the cabin of an aircraft.

  That is, according to the configuration of the present embodiment, the difference between the pressure directly received by the check valve 9 from the portion 6 a upstream of the capacitor 7 and the pressure directly received by the check valve 9 from the portion 6 b downstream of the capacitor 7 is different. When the check valve 9 exceeds the urging force that urges the check valve 9 to the closed state, the check valve 9 changes to the open state by the action of the pressure against the urging force. can get. In other words, a special mechanism for detecting a pressure difference between the upstream portion 6a and the downstream portion 6b of the low-temperature air flow path 6 is not provided outside the check valve 9, and the ice is frozen. Without using a swirl flow generating means or a double pipe for removing moisture, the low temperature air can be bypassed with a simple configuration to ensure the flow rate of the low temperature air. Therefore, it is impossible to supply a sufficient amount of temperature-controlled air to the pressurizing chamber due to a small number of parts and the amount of icing moisture adhering to the capacitor 7 while suppressing the total mass of parts necessary for this configuration. Can be suppressed.

  The present invention is not limited to the embodiment described above.

  For example, in the air conditioning system as shown in the circuit diagram of FIG. 2 in which the bypass flow path is omitted in the above-described embodiment, instead of the capacitor 7 of the above-described embodiment, as shown in FIGS. A heat exchange section 27a for exchanging heat with low-temperature air and a bypass flow path 28 for supplying the low-temperature air to the pressurizing chamber without causing heat exchange are provided in the same housing. A condenser 27 having a check valve 29 as described below may be used at the inlet of the bypass passage 28. In this embodiment, the heat exchange part 27a corresponds to the heat exchange part of the present invention, and the bypass flow path 28 corresponds to the bypass flow path of the present invention.

  The condenser 27 includes the heat exchanging portion 27a for exchanging heat between the low temperature air flowing through the low temperature air flow path and the high temperature air flowing through the high temperature air flow path, and the low temperature air as the heat. The bypass passage 28 is configured to flow without passing through the exchange portion 27a, that is, without being subjected to heat exchange, and the partition wall 27b that partitions the bypass passage 28 and the high-temperature air passage 5. Hot air flows through the capacitor 27 in the direction of arrow X. On the other hand, the low-temperature air flows in the capacitor Y direction in the arrow Y direction.

  The heat exchanging portion 27a is formed by laminating a large number of flat plates 27a1, and between the plates 27a1 adjacent to each other, a high temperature side passage 27a2 for passing high temperature air and a low temperature side for allowing low temperature air to pass therethrough. The passages 27a3 are alternately provided. The heat exchanging portions 27a are provided in a pair in the upper and lower sides.

  The bypass flow path 28 is formed using a space between the heat exchange portions 27a. Further, as described above, the bypass flow path 28 is partitioned by the high-temperature air flow path 5 and the partition wall 27b.

  A check valve 29 as described below is provided at the inlet of the bypass passage 28. The check valve 29 is normally biased to a closed state S as shown in FIG. 3 by biasing means such as a torsion coil spring (not shown), and upstream of the heat exchange part of the low-temperature gas flow path 6. When the check valve 29 receives a difference in pressure directly from the part 6a and the downstream part 6b, more specifically, when the pressure difference between the inlet and the outlet of the capacitor 27 is equal to or greater than a predetermined value, the check valve 29 It is configured to change to the open state O as shown in FIG. 4 by the action of the pressure against the urging force.

  Even in such a configuration, the difference between the pressure directly received by the check valve 29 from the upstream side and the pressure directly received by the check valve 29 from the downstream side causes the biasing force that biases the check valve 29 to the closed state. If it exceeds, the check valve 29 changes to the open state O by the action of the pressure against the urging force, so that the effect of the configuration according to the above-described embodiment can be obtained similarly. In other words, a special mechanism for detecting the pressure difference between the upstream side and the downstream side of the condenser 27 is not provided outside the check valve, and the swirling flow generating means or the double pipe for removing frozen moisture is removed. Without using the low temperature gas can be bypassed with a simple configuration to ensure the flow rate of the low temperature gas. Therefore, with the small number of parts, and while suppressing the total mass of parts required for this configuration, the occurrence of a problem that a sufficient amount of temperature-controlled gas cannot be supplied due to adhesion of icing moisture to the capacitor 27 is suppressed. it can.

  Further, a plurality of bypass flow paths and check valves may be provided. Further, in the condenser as described in the previous stage, three or more heat exchange portions may be provided, and a plurality of bypass passages between the heat exchange portions and a plurality of check valves provided for each bypass passage may be provided. Good. In this case, the predetermined value of the pressure difference necessary for changing the plurality of check valves to the open state may be made different for each check valve.

  And it is not limited to the air conditioner for aircraft, and is not limited to the one that circulates air, but the heat exchange that exchanges heat between the gas that circulates in the high-temperature gas fluid and the gas that circulates in the low-temperature gas flow path. The present invention may be applied to any air-conditioning system that includes a section and a bypass passage that is provided such that the upstream side and the downstream side of the heat exchange part of the low-temperature gas passage communicate with each other. That is, even if it is an air conditioning system used for purposes other than aircraft, or used for temperature adjustment of gases other than air, it further comprises a check valve provided in the bypass flow path. The check valve is normally energized in a closed state, and the difference in pressure that the check valve directly receives from the upstream side and the downstream side of the heat exchange part of the low-temperature gas flow path is a predetermined value or more. In this case, the main effect of the present invention can be obtained in the same manner as long as the check valve is changed to the open state against the urging force by the pressure directly acting on the check valve from the upstream side.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The structure explanatory drawing of the air conditioner which concerns on the 1st Example of this invention. Structure explanatory drawing of the air conditioning apparatus which concerns on the 2nd Example of this invention. The perspective view which shows schematically the heat exchange part and check valve which concern on the Example. Operation | movement explanatory drawing of the check valve shown corresponding to FIG. Structure explanatory drawing of the conventional air conditioning system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air conditioning system 5 ... High temperature air flow path 6 ... Low temperature air flow path 7 ... Condenser (heat exchange part)
27a ... Heat exchange part 8, 28 ... Bypass flow path 9, 29 ... Check valve

Claims (1)

Heat exchange is performed between a high-temperature gas flow path for circulating a high-temperature gas, a low-temperature gas flow path for flowing a low-temperature gas, and a high-temperature gas flowing through the high-temperature gas flow path and a low-temperature gas flowing through the low-temperature gas flow path. A heat exchanging portion for allowing the gas flowing in the low temperature gas flow channel to communicate with the upstream side and the downstream side of the heat exchanging portion of the low temperature gas flow channel so as to flow without passing through the heat exchanging portion. A bypass flow path provided, and a check valve provided in the bypass flow path,
When the check valve is normally energized in a closed state and the difference in pressure directly received by the check valve from the upstream side and the downstream side of the heat exchange part of the low-temperature gas flow path is a predetermined value or more In addition, the air-conditioning system is characterized in that it changes to an open state against the urging force by the pressure directly acting on the check valve.

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